A pouring mold for pouring a concrete outer wall of a ductile cast iron top pipe

Abstract

The utility model relates to nodular cast iron push pipe production equipment technical field discloses a kind of pouring mould for nodular cast iron push pipe concrete outer wall pouring, including outer mould and bottom die, outer mould is made of one-piece plate structure using Q355B material, outer mould is formed into a cylindrical structure under the self elastic effect after being aligned and connected by setting locking assembly two ends, the height of this cylindrical structure is compatible with the standard length of nodular cast iron push pipe of the outer wall to be poured;Bottom die includes bottom plate, and the top surface of bottom plate is provided with the vertically arranged extension pipe, and the top surface of extension pipe is provided with the connecting block for being connected with the nodular cast iron short pipe of the outer wall to be poured, and the height difference from the top surface of connecting block to the top surface of bottom plate is compatible with the length of nodular cast iron short pipe of the outer wall to be poured;The utility model has the advantages of improving dismounting mould efficiency, reducing personnel cost, and good adaptability when short pipe production.

Description

Technical Field

[0001] This utility model relates to a casting mold for pouring concrete on the outer wall of ductile iron jacking pipes, and belongs to the technical field of ductile iron jacking pipe production equipment. Background Technology

[0002] Ductile iron pipe jacking is a type of pipe made of ductile iron, primarily used in underground pipeline laying projects, especially in situations where large-scale excavation is not feasible. Currently, ductile iron pipe jacking, with its advantages of "trenchless construction + material performance," has become a key technical solution for addressing the needs of high-flow, high-pressure, and long-distance underground pipelines, and is widely used in water supply and drainage, gas transmission, and other pipeline projects. To further improve the overall structural stability, impermeability, and service life of ductile iron pipe jacking, the industry commonly employs a process of pouring a concrete layer onto the outer wall of the pipe, forming a composite structure of "ductile iron core + concrete outer wall," thereby enhancing the performance of the ductile iron pipe jacking.

[0003] However, existing casting molds used for pouring concrete on the outer wall of ductile iron jacking pipes have many technical defects in practical applications: like Figure 1 As shown, Figure 1 This is a schematic diagram of an existing casting mold. Its structure consists of two halves that open at the joint, sealed with a rubber ring. Assembly and disassembly require two teams (two people per team) working simultaneously. After disassembly, one half is hoisted first, followed by the other half. Each set of mold assembly and disassembly requires two hoisting operations, resulting in low efficiency and a large number of required personnel. Furthermore, this type of casting mold is primarily designed for standard-length (6m) jacking pipes. For shorter pipes less than 3m (such as those requiring 2m or 4m in some projects), the bottom formwork in traditional casting molds is inadequate. Currently, the only solution to this problem is to increase the length of the outer mold (e.g., 2m, 3m, and 4m), which results in insufficient adaptability when producing short pipes. Furthermore, most existing casting molds are rigid structures with two sides that fit together. During concrete vibration, cement slurry is prone to leaking out from the gap between the two sides. This not only wastes raw materials but also creates defects such as honeycomb and pitting on the outer surface of the concrete, increasing repair costs. It also results in poor sealing performance and unstable casting quality. Utility Model Content

[0004] In order to solve the above-mentioned problems in the existing technology, the present invention provides a casting mold for pouring concrete on the outer wall of ductile iron jacking pipe.

[0005] The technical solution of this utility model is as follows: A casting mold for pouring concrete for the outer wall of a ductile iron jacking pipe includes an outer mold and a bottom mold. The outer mold is an integral plate-shaped structure made of Q355B material. After the two ends of the outer mold are aligned and connected by locking components, it forms a cylindrical structure under its own elasticity. The height of this cylindrical structure is adapted to the standard length of the ductile iron jacking pipe to be poured for the outer wall. The bottom mold includes a bottom plate. A vertically arranged extension pipe is provided on the top surface of the bottom plate. A connecting block is provided on the top surface of the extension pipe for connecting with the ductile iron short pipe to be poured for the outer wall. The height difference between the top surface of the connecting block and the top surface of the bottom plate is adapted to the length of the ductile iron short pipe to be poured for the outer wall.

[0006] The locking assembly includes door panels on the outer walls of both ends of the outer mold. The door panels are arranged along the height direction of the outer mold. One door panel has a plug-in block, and the other door panel has a plug-in groove that is adapted to the plug-in block. After the two ends of the outer mold are aligned, the two door panels are tightly fitted together and the plug-in block is inserted into the plug-in groove. Both door panels have connecting plates arranged vertically along the door panel layout direction. Each connecting plate has several connecting holes, which are arranged one-to-one. Connecting screws are inserted into the corresponding connecting holes, and locking nuts are locked into the connecting screws to connect the two connecting plates together.

[0007] The connecting plates on both sides are provided with several reinforcing ribs, and each reinforcing rib connects the corresponding connecting plate to the outer mold.

[0008] The connecting plates on both sides are provided with several positioning holes. The positioning holes on the connecting plates on both sides are arranged in a one-to-one correspondence. Positioning pins are inserted into the corresponding positioning holes to enable the connecting plates on both sides to be positioned.

[0009] The outer wall of the outer mold is also provided with a ladder and a vibrator. The ladder is set in a way that is close to the locking assembly, and the vibrator is arranged in a ring array on the outer mold with the center line of the outer mold as the array center.

[0010] The top of the connecting block is also provided with a positioning block that is adapted to the inner diameter of the ductile iron short pipe whose outer wall needs to be cast. The top surface and side wall of the connecting block are provided with sealing grooves in annular structure, and each sealing groove is provided with a sealing rubber ring.

[0011] This utility model has the following beneficial effects: 1. This utility model sets the outer mold as an integrated plate structure made of Q355B material. In use, the two ends are aligned and connected by locking components to form a cylindrical structure. By placing a standard length of ductile iron jacking pipe to be poured into the outer wall inside the outer mold, the concrete outer wall of the standard length (6m) ductile iron jacking pipe can be poured. Compared with the prior art, the single-sided locking outer mold structure can be completed in one hoisting operation, and the mold assembly and disassembly work only requires one group of workers to lock and unlock the locking components. It has the advantages of improving the efficiency of mold assembly and disassembly and reducing labor costs.

[0012] 2. This utility model, by setting a bottom mold, adapts the length of the extension pipe from the bottom wall to the top surface of the bottom plate in the bottom mold to the length of the ductile iron short pipe whose outer wall needs to be cast. When casting the ductile iron short pipe whose outer wall needs to be cast, by selecting a bottom mold of appropriate length, placing the bottom mold on the external casting base, placing the ductile iron short pipe of corresponding length on the bottom mold, and then having the outer mold fit inside the bottom mold and the ductile iron short pipe whose outer wall needs to be cast, ensuring that the bottom wall of the outer mold is placed on the top surface of the bottom plate in the bottom mold, the casting can then be carried out, producing a ductile iron short pipe with a concrete outer wall. Compared with the prior art, there is no need to add a more complex and costly outer mold; only the bottom mold of appropriate length needs to be replaced to cast the outer wall of the ductile iron short pipe of the required length. It has the advantage of good adaptability when producing short pipes.

[0013] 3. The outer mold of this utility model is an integrated structure. Cement slurry may leak out only at the locking component. The locking component can effectively seal the gaps at the ends of the outer mold during connection by the mutual adhesion of the two side panels and the insertion of the plug into the plug groove, thereby minimizing the leakage of cement slurry. Compared with the prior art, it has the advantages of good sealing performance and stable casting quality. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an existing casting mold; Figure 2 This is a schematic diagram of the structure of the outer mold in this utility model; Figure 3 This is a top view of the outer mold in this utility model; Figure 4 This is a schematic diagram of the bottom mold structure of this utility model; Figure 5 This is a partial structural diagram of the locking component in this utility model.

[0015] The reference numerals in the figure are as follows: 1. Outer mold; 2. Bottom mold; 21. Base plate; 22. Extension tube; 23. Connecting block; 24. Positioning block; 25. Sealing groove; 3. Locking assembly; 31. Door panel; 32. Insertion block; 33. Insertion groove; 34. Connecting plate; 35. Connecting hole; 36. Connecting screw; 37. Locking nut; 38. Reinforcing rib; 39. Positioning pin; 4. Ladder; 5. Vibrator. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0017] Example: Please refer to Figures 2-5 This embodiment provides a casting mold for pouring concrete for the outer wall of a ductile iron jacking pipe. The mold includes an outer mold 1, which is an integral plate-like structure made of Q355B material. Q355B material has advantages such as high yield strength, high toughness, and good elongation, enabling the outer mold 1 to have good compressive strength and the characteristics of not easily cracking after bending and being able to spring back. The outer mold 1 forms a cylindrical structure under its own elasticity after the two ends of the locking assembly 3 are aligned and connected. The locking assembly 3 is in a locked state when connecting the two ends of the outer mold 1, and in an unlocked state when the connection is released. The height of this cylindrical structure formed by the outer mold 1 and the locking assembly 3 is adapted to the standard length of the ductile iron jacking pipe to be poured, which is 6m. The inner diameter of this cylindrical structure is adapted to the outer diameter of the ductile iron jacking pipe to be poured. Due to its inherent characteristics, the outer mold 1 can automatically spring open when the locking assembly 3 is in the unlocked state, facilitating subsequent demolding.

[0018] To facilitate the hoisting operation, in this embodiment, symmetrically arranged lifting lugs can be provided on the top outer wall of the outer mold 1 to facilitate the hoisting of the outer mold 1.

[0019] In this embodiment, the locking assembly 3 includes door panels 31 on the outer walls of both ends of the outer mold 1. Both door panels 31 are fixedly mounted on the outer walls of the outer mold 1 and are arranged along the height direction of the outer mold 1. One door panel 31 has a plug-in block 32, and the other door panel 31 has a plug-in groove 33 that is adapted to the plug-in block 32. After the two ends of the outer mold 1 are aligned, the two door panels 31 can be tightly fitted together, and the plug-in block 32 is inserted into the plug-in groove 33. Both door panels 31 have connecting plates 34 arranged vertically along the direction of the door panels 31. Both connecting plates 34 have several connecting holes 35. The specific number and distribution of the connecting holes 35 can be set according to actual conditions, as long as the connecting holes 35 on both connecting plates 34 are arranged in a one-to-one correspondence for subsequent locking operations. All the corresponding connecting holes 35 on the two connecting plates 34 are connected together by inserting connecting screws 36 and locking nuts 37 into the connecting screws 36, so that the two connecting plates 34 can be connected together, thereby connecting the two door panels 31 together, which can connect the two ends of the outer mold 1.

[0020] To improve the structural strength of the locking assembly 3, in this embodiment, several reinforcing ribs 38 are provided on both sides of the connecting plate 34. The specific number and distribution of the reinforcing ribs 38 can be selected and set according to the actual situation. Each reinforcing rib 38 connects the corresponding connecting plate 34 to the outer mold 1 together, so as to ensure that the connecting plate 34 is not prone to deformation or breakage, thereby improving the structural strength of the locking assembly 3 and ensuring the locking effect of the locking assembly 3 on the outer mold 1.

[0021] To facilitate the use of the locking assembly 3, in this embodiment, several positioning holes are also provided on the connecting plates 34 on both sides. The specific number and distribution of the positioning holes can be set according to the actual situation, as long as the positioning holes on the connecting plates 34 on both sides are arranged in a one-to-one correspondence, so as to facilitate the subsequent positioning work. The positioning holes on the connecting plates 34 on both sides are arranged in a one-to-one correspondence, and positioning pins 39 are inserted into all corresponding positioning holes on the connecting plates 34 on both sides to enable the connecting plates 34 on both sides to be positioned, thereby facilitating the subsequent locking work.

[0022] To facilitate the use of the outer mold 1, in this embodiment, a ladder 4 and a vibrator 5 are also provided on the outer wall of the outer mold 1. The ladder 4 is set close to the locking component 3 so that construction personnel can use the ladder 4 to perform the corresponding mold assembly and disassembly work. The vibrator 5 is arranged in a ring array on the outer mold 1 with the center line of the outer mold 1 as the array center. The vibrator 5 is set to vibrate the concrete inside the outer mold 1 by vibrating the outer mold 1 so as to facilitate the subsequent demolding work.

[0023] With the aforementioned setup, when pouring concrete for the outer wall of a standard-length ductile iron jacking pipe, firstly, the vertical standard-length ductile iron jacking pipe is hoisted onto the corresponding mold base in the external grouting pit. Then, the outer mold 1 is installed. After aligning the two ends of the outer mold 1, positioning pins 39 are inserted into the corresponding positioning holes on the connecting plates 34 on both sides for positioning. Then, connecting screws 36 are inserted into the corresponding connecting holes 35 on the connecting plates 34 on both sides, and locking nuts 37 are screwed into the connecting screws 36. However, the locking nuts 37 are not locked onto the connecting screws 36 at this time, so that there is an opening between the two door panels 31. The opening between the two door panels 31 makes the cross-section of the outer mold 1 a circular structure with an opening. At this time, the inner diameter of the outer mold 1 will be larger than the outer diameter of the standard-length ductile iron jacking pipe, which facilitates the hoisting of the outer mold 1. Next, the outer mold 1 is hoisted into the external grouting pit, and then fitted onto the standard length of the ductile iron jacking pipe after the pipe is lowered. The workers then tighten all the locking nuts 37, so that the outer mold 1 closes to form a closed circular structure. At this point, the insertion block 32 is inserted into the insertion slot 33, and the two side panels 31 are tightly fitted together. Grouting can then be carried out. After the grouting is completed, the vibrator 5 is started to dislodge the concrete adhering to the inner wall of the outer mold 1. The workers then use the ladder 4 to remove all the locking nuts 37 from the connecting screws 36. At this point, the outer mold 1 automatically springs open, facilitating subsequent demolding.

[0024] In this embodiment, the casting mold further includes a bottom mold 2, which includes a bottom plate 21. The diameter of the bottom plate 21 is larger than the inner diameter of the cylindrical structure formed by the outer mold 1, so that the outer mold 1 can be placed on the bottom plate 21 during the casting process. A vertically arranged extension tube 22 is provided on the top surface of the bottom plate 21. The diameter of the extension tube 22 is smaller than the inner diameter of the cylindrical structure formed by the outer mold 1, so that the outer mold 1 can be fitted in later. A connecting block 23 is provided on the top surface of the extension tube 22 for connecting with the ductile iron short pipe to be cast. The connecting block 23 is cylindrical, and its diameter is the same as the inner diameter of the cylindrical structure formed by the outer mold 1, so that the ductile iron short pipe to be cast can be placed on the connecting block 23 and the outer mold 1 can be fitted in. The height difference between the top surface of the connecting block 23 and the top surface of the base plate 21 is adapted to the length of the ductile iron short pipe for which the outer wall needs to be poured. Specifically, the height difference between the top surface of the connecting block 23 and the top surface of the base plate 21 is the standard length of the ductile iron jacking pipe, i.e., 6m, minus the length of the ductile iron short pipe for which the outer wall needs to be poured. A positioning block 24, adapted to the inner diameter of the ductile iron short pipe for which the outer wall needs to be poured, is also provided on the top of the connecting block 23. A sealing groove 25 with a ring structure is provided on the top surface and side wall of the connecting block 23. Each sealing groove 25 contains a sealing rubber ring. The sealing rubber rings are designed to minimize concrete leakage downwards onto the base plate 21.

[0025] With the aforementioned setup, when casting the ductile iron short pipe for which the outer wall needs to be cast, taking a ductile iron short pipe with a length of 4m as an example, a bottom mold 2 with a height difference of 2m between the top surface of the connecting block 23 and the top surface of the bottom plate 21 is selected. The bottom mold 2 is directly hoisted into the external grouting pit without needing to be installed on the grouting base. Then, the 4m ductile iron short pipe is hoisted onto the bottom mold 2. Specifically, the 4m ductile iron short pipe is positioned on the top surface of the connecting block 23 of the bottom mold 2, and the positioning block 24 is fitted inside it to complete the required positioning. The subsequent procedures are similar to those described above for pouring concrete for the outer wall of the standard-length ductile iron jacking pipe. The outer mold 1 is installed and then hoisted into the corresponding external grouting pit. The outer mold 1 then houses the extension pipe 22, connecting block 23, and the ductile iron short pipe on the bottom mold 2, placing the outer mold 1 on the bottom plate 21 of the bottom mold 2. After this, pouring and demolding can proceed. Since the 4m ductile iron short pipe, combined with the 2m height difference between the top surface of the connecting block 23 and the top surface of the bottom plate 21 of the bottom mold 2, can form a 6m structure, it meets the design standards of the outer mold 1.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A casting mold for pouring concrete on the outer wall of ductile iron jacking pipes, characterized in that: The outer mold (1) and the bottom mold (2) are included. The outer mold (1) is an integral plate structure made of Q355B material. The outer mold (1) forms a cylindrical structure under its own elasticity after the two ends are aligned and connected by the locking component (3). The height of this cylindrical structure is adapted to the standard length of the ductile iron jacking pipe to be cast for the outer wall. The bottom mold (2) includes a bottom plate (21). A vertically arranged extension pipe (22) is provided on the top surface of the bottom plate (21). A connecting block (23) is provided on the top surface of the extension pipe (22) for connecting with the ductile iron short pipe to be cast for the outer wall. The height difference between the top surface of the connecting block (23) and the top surface of the bottom plate (21) is adapted to the length of the ductile iron short pipe to be cast for the outer wall.

2. The casting mold for pouring concrete on the outer wall of ductile iron jacking pipes according to claim 1, characterized in that: The locking assembly (3) includes door panels (31) on the outer walls of both ends of the outer mold (1). The door panels (31) are arranged along the height direction of the outer mold (1). One door panel (31) is provided with a plug-in block (32), and the other door panel (31) is provided with a plug-in groove (33) that is adapted to the plug-in block (32). After the two ends of the outer mold (1) are aligned, the two door panels (31) are tightly fitted together and the plug-in block (32) is inserted into the plug-in groove (33). 3) Internal setting; both sides of the door panel (31) are provided with connecting plates (34) arranged vertically along the layout direction of the door panel (31). Both sides of the connecting plates (34) are provided with several connecting holes (35). The connecting holes (35) on both sides of the connecting plates (34) are arranged one-to-one. The corresponding connecting holes (35) are connected by inserting connecting screws (36) and locking nuts (37) into the connecting screws (36) so that the two sides of the connecting plates (34) can be connected together.

3. A casting mold for pouring concrete on the outer wall of ductile iron jacking pipes according to claim 2, characterized in that: Several reinforcing ribs (38) are provided on both sides of the connecting plate (34), and each reinforcing rib (38) connects the corresponding connecting plate (34) to the outer mold (1).

4. A casting mold for pouring concrete on the outer wall of ductile iron jacking pipes according to claim 2, characterized in that: Several positioning holes are also provided on the connecting plates (34) on both sides. The positioning holes on the connecting plates (34) on both sides are set in a one-to-one correspondence. Positioning pins (39) are inserted into the corresponding positioning holes to enable the connecting plates (34) on both sides to be positioned.

5. A casting mold for pouring concrete on the outer wall of ductile iron jacking pipes according to claim 1, characterized in that: The outer wall of the outer mold (1) is also provided with a ladder (4) and a vibrator (5). The ladder (4) is set to fit tightly against the locking assembly (3), and the vibrator (5) is arranged in a ring array on the outer mold (1) with the center line of the outer mold (1) as the array center.

6. A casting mold for pouring concrete on the outer wall of ductile iron jacking pipes according to claim 1, characterized in that: The top of the connecting block (23) is also provided with a positioning block (24) that is adapted to the inner diameter of the ductile iron short pipe whose outer wall needs to be cast. The top surface and side wall of the connecting block (23) are provided with sealing grooves (25) in annular structure, and each sealing groove (25) is provided with a sealing rubber ring.

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